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Author Topic: Yo................ Vincenzo.......................  (Read 135294 times)
AC5UP
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« Reply #15 on: November 11, 2011, 06:48:05 AM »

Before anyone gets their skivvies in a knot over this concept, let me say it's proper TECHnique to do repair and alignment work using accurate test equipment with normal line voltage, temperature, lighting and proper grounding. When in doubt, consult the schematic for any mention of manufacturer's test conditions and recommendations. With tube equipment there should also be a 10-15 minute (minimum) warm up period.

Nominal line voltage in the 50's was closer to 110 than the 120 it is today and varied more widely. Voltage regulation is better today and that's part of the answer to the quiz... An AA5 at 100 volts will have a slight loss in audio amplifier power (lower B+ and cooler filaments) plus the local oscillator may run off slightly frequency. That's it. Otherwise it will play well at 105 volts and back in the day many did. The antenna circuit will tune the same regardless of line voltage as will the IF transformers. At worst the radio might need a slight touch-up on the oscillator trimmer at 120 volts and that's an easy adjustment. Tweak until the top end of the tuning dial lines up.

BTW: Normal AC in Japan is 100 volts @ 60 cycles and that explains the transformer. Video monitors need the isolation of a power transformer to reduce the chance of hum bars in the picture. This was an NEC monitor and I suspect the domestic version was shipped with a 100 to 100 volt transformer while the export US versions were 120 to 100. Either way it's the same 100 volt chassis.......
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AC5UP
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« Reply #16 on: November 20, 2011, 01:08:49 PM »

If someone did a superior cabinet restoration on this one it could be a real standout......... http://www.shopgoodwill.com/viewItem.asp?ItemID=8946558

Beautiful wood selection plus a six tube chassis, AM and SW. http://www.nostalgiaair.org/Resources/864/M0014864.htm

Hot chassis, but aside from that it's a looker.  Wink
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N4NYY
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« Reply #17 on: November 20, 2011, 04:21:22 PM »

Where the hell are the knobs? I hate that!
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AC5UP
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« Reply #18 on: November 20, 2011, 06:01:54 PM »

Don't be a knob snob. They're easy to replace...................

But did you look at the wood? We're talking the life work of a tree that sacrificed everything to make that cabinet look as good as it does. Somewhere there's a mighty oak that sprouted in the late 30's from an acorn that came from the same tree. Never knowing its parent, its family history, the warmth and nurturing that can only come from birds of a feather or trees of a leaf, that still carries the pain of separation from losing a parent to a veneer mill.........

And what are you worried about? Three plastic knobs. How insensitive!

Sometimes I feel like I've never known you at all. <sniff!>
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AC5UP
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« Reply #19 on: December 02, 2011, 08:54:32 AM »

If you want to know what a collectible radio looks like, this would be one... http://www.shopgoodwill.com/viewItem.asp?ItemID=9008351

Odd brand name, unusual design, looks reminiscent of Art Deco or that someone was influenced by Frank Lloyd Wright. Bakelite. AM / FM and in very good used condition.

And here's a CB cooler than your TRC-455: http://www.shopgoodwill.com/viewItem.asp?ItemID=8994932
Sure, it's only a 23 channel rig, but who cares? You can't talk on more than one channel at a time....   Grin
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AC5UP
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« Reply #20 on: December 12, 2011, 05:56:00 PM »

http://www.shopgoodwill.com/viewItem.asp?ItemID=9046581

Six tubes, all 12 volt metal except for the rectifier and AF output, RF amplifier stage, #51 Mazda pilot light, sweeeeeeeeeeeeeeeeeeet !

A radio like that could play all night and still get up early for the farm report.................................
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N4NYY
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« Reply #21 on: December 12, 2011, 06:45:34 PM »

That is a nice one. I have about 5 projects all needing 1-2 small parts on backorder. They are backlogging me.
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AC5UP
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« Reply #22 on: December 12, 2011, 07:40:44 PM »

Appearing next on my work bench will be one of these: http://www.ppinyot.com/E/record_junior_196.htm

Excellent cosmetic condition, plays well on FM, but AM has low sensitivity and a feedback / distortion thing that indicates a problem in the IF. Also a slight hum in the audio plus the piano switches are in need of cleaning. The dial plate isn't as contrasty as the example shown above as the backing plate is a medium beige, but I think a nice re-paint in a primordial forest or even hammertone green would really bring out the best in it.

I've had the radio for years but kept hoping I'd either figure it out or stumble across a free schematic. No deal either way, but a couple of weeks ago I found an Emud T7 schematic that looks remarkably similar. The T7 has short and long wave bands plus a tuning eye. Mine does not, and I need to measure the IF frequency before I do any alignment. The T7 has IF's on 468 KC's and 10.7 MC's which is kinda' different............
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N4NYY
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« Reply #23 on: December 13, 2011, 06:02:02 AM »

I have seen the pipe cutting of the filters caps and installing new ones. My questions is, how to you reattach the cut section? Most are aluminum, and cannot be soldered. And gluing it is cheesy.
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N4NYY
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« Reply #24 on: December 14, 2011, 03:01:55 PM »

5UP,

http://philadelphia.craigslist.org/ele/2696893431.html

Driving distance. Is it worth it? Little info on Google. Seems to be a knockoff. No schematic in the first few searches.
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AC5UP
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« Reply #25 on: December 14, 2011, 03:58:08 PM »

That looks exactly like a Japanese clone of the Hallicrafters S-120 and if it appeals to you I wouldn't hesitate to put the grab on it. No schematic? No problem. Use an S-120 schematic and rebuild it to match. No kidding... The S-120 is an AA5 in disguise (four tubes plus a selenium rectifier) and I have a strong hunch the Starlite will be very similar. The S-120 tube lineup was a common design in the 60's and for $20 someone has already done the hard work of packaging the front end coils, bandswitch, IF cans, tuning condenser and all-important glass dial with un-molested markings into an attractive desktop case.

One thing you should be aware of is that any AA5 like this will be a bow-wow doggie above 12 MHz or so. No RF amp and no weak signal ability on the highest band. But, 31 Meters and below should be more than useable with a random wire.

In other offerings, here's one that's more your style: http://www.shopgoodwill.com/viewItem.asp?ItemID=9073145
40 channels of SSB plus a D-104. Sure, the mic has what you would consider to be an ugly chrome base, but if you don't buy it, it won't get painted.
Maybe that would be a good thing.

Then there's this: http://www.shopgoodwill.com/viewItem.asp?ItemID=9066998     Shocked    (allegedly there is an all-band unlock mod)

Be sure to click these as well: http://www.shopgoodwill.com/viewItem.asp?ItemID=9075298

http://www.shopgoodwill.com/viewItem.asp?ItemID=9076718

http://www.shopgoodwill.com/viewItem.asp?ItemID=9083778

http://www.shopgoodwill.com/viewItem.asp?ItemID=9075065

And......... Saving the best for last: http://www.shopgoodwill.com/viewItem.asp?ItemID=9063175
They call it the boomerang 'cuz no matter how long you listen, you'll keep coming back for more...  Roll Eyes
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AC5UP
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Posts: 3825




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« Reply #26 on: December 17, 2011, 11:18:28 AM »

No shack complete without one: http://www.shopgoodwill.com/viewItem.asp?ItemID=9101578
And here's a companion web page for you to ignore: http://www.jamminpower.com/main/GR%20Bridge.html

BTW: Still shuffling through my junque and found an oddball transformer. Nice beefy dude, terminal board on both sides for the two primary and two secondary windings. All four windings are center tapped and 'mirrors' of the other on each side.

Turns out it's a Stancor A-3894 'Polypedance' modulation transformer that can match almost any tube modulator to any RF amplifier. This one is good for 125 watts and when I finally get around to homebrewing something for AM that will be the dude. Could sound good, and with 3 dB of headroom at the 60 watt level be more than I need to sound like a professional radio pronouncer on 75 Meter AM 'fone.
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N4NYY
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« Reply #27 on: December 18, 2011, 07:04:04 AM »

Nelson,

Any of these stand out? What about top-right maroon color portable?

http://philadelphia.craigslist.org/clt/2744071304.html
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AC5UP
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« Reply #28 on: December 18, 2011, 08:09:00 AM »

At forty bucks none of them jump out as a deal.

The Emud is the nicest of the bunch, the RCA in the lower left is a substantial piece that displays well, but aside from that........ Meh.

If you've been watching this one: http://www.shopgoodwill.com/viewItem.asp?ItemID=9076718
The bidding jumped up and I think I know why... Six tube chassis with an RF amp ahead of the 1st mixer plus six volt octal tubes on a transformer power supply. An attractive radio that wasn't a cheapie, should play well, nothing exotic inside.
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AC5UP
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« Reply #29 on: December 25, 2011, 11:07:44 AM »

So there I am... Still trying to figure out why the AM section of my Emud Rekord Jr 196 radio sounds like it wants to break into self oscillation. Been poking at the radio off & on for years and never got very far 'cuz the chassis layout is very, very foreign.

Then I decide I'm going to at least clean the dial glass before I put it back together. May never be a better time. Pull the glass & backing plate. Can't help but notice there are a few extra contacts on the piano switches buried behind the dial assembly. Cleaned the glass and painted the backing plate a lovely oxidized bronze color. Shot some CRC 2-26 on the piano switches. Cleaned up the overspray and re-assembled the front of the radio.

Then I discover.............. The AM side of the radio now plays like a Sinatra record at an Italian wedding.     Couldn't ask for better.

All this time and all it had was a dirty switch between the AM and FM local oscillators.                 D'oh!

Still needs a new filter condenser in the PS as it does have a slight hum. But aside from that, with the clean glass and bandswitch to match it looks and plays almost like new.
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